glScissor defines a rectangle,
called the scissor box, in window coordinates. The first two arguments,
x and y, specify the lower left corner of the box. width and height specify
the width and height of the box.

To enable and disable the scissor test,
call glEnable and glDisable with argument GL_SCISSOR_TEST. The test is initially
disabled. While the test is enabled, only pixels that lie within the scissor
box can be modified by drawing commands. Window coordinates have integer
values at the shared corners of frame buffer pixels. glScissor(0,0,1,1)
allows modification of only the lower left pixel in the window, and glScissor(0,0,0,0)
doesn't allow modification of any pixels in the window.

When the scissor
test is disabled, it is as though the scissor box includes the entire window.